In order to establish an optimum surface protection system for newly constructed concrete structures with silane type water barrier penetrants, fundamental experimental study was conducted for 2 water barrier penetrants which have shown good waterproofing performances in 5 years exposure test.
For 3 kinds of concrete mix proportions, such as W/C of 42%, 50%, 65%, the effects of age of concrete at the application of penetrants, and the effects of water supplying conditions before and after the application, on penetration depth and waterproofing performance were examined.
The age of concrete at the application of penetrants considerably affected penetration depth and waterproofing performace. If we make a point of waterproofing performance, water barrier penetrants should be applied in early age.
The water supplying conditions before and after the application considerably affected penetration depth and waterproofing performance. The effects were different according to W/C of concrete.
Based on experimental results, a direction of surface protection system with silane type penetrants was discussed.

The hardenable cement based compounds (SHCC) withstand a higher tensile stress after the first cracking, over a significant range of tensile stress. This increased strength and deformability is achieved by an effective crack bridge through fibers, through multiple cracks of widths in the micro-range. In this paper we examine whether the crack width limitation translates into greater durability through delayed entry of moisture, gas and other harmful substances. This is done by evaluating the results of the recent testing of several laboratories at the international level. The question of whether these small crack widths are maintained under sustained, cyclic or other load paths is also addressed, concluding that crack widths are not independent of the load path. This contribution summarizes the status report prepared in the period 2005-2009 by Sub-Committee 2 of RILEM TC 208-HFC: Durability of SHCC. The potential of the comparatively new composite material becomes obvious, however, it is clearly indicated that further research is needed before fully understanding the basic mechanisms underlying the durability of SHCC. The JSCE Recommendation for Designing Structural Elements of SHCC (HPFRCC) is a useful tool, but should be complemented by a recommendation on the design of shelf life in the future.

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